CN102341590B - Arrangement for cooling of recirculating exhaust gases of inner combustion engine - Google Patents

Arrangement for cooling of recirculating exhaust gases of inner combustion engine Download PDF

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Publication number
CN102341590B
CN102341590B CN201080010878.3A CN201080010878A CN102341590B CN 102341590 B CN102341590 B CN 102341590B CN 201080010878 A CN201080010878 A CN 201080010878A CN 102341590 B CN102341590 B CN 102341590B
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China
Prior art keywords
cooler
cooling
exhaust gas
waste gas
gas
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Expired - Fee Related
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CN201080010878.3A
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Chinese (zh)
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CN102341590A (en
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Z·卡多斯
E·瑟德贝里
R·迪布达尔
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Scania CV AB
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Scania CV AB
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
    • F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/30—Arrangements for supply of additional air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • F01N13/0097—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series the purifying devices are arranged in a single housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/30—Arrangements for supply of additional air
    • F01N3/306—Preheating additional air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/30—Arrangements for supply of additional air
    • F01N3/32—Arrangements for supply of additional air using air pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/30—Arrangements for supply of additional air
    • F01N3/34—Arrangements for supply of additional air using air conduits or jet air pumps, e.g. near the engine exhaust port
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
    • F02B29/04—Cooling of air intake supply
    • F02B29/0406—Layout of the intake air cooling or coolant circuit
    • F02B29/0412—Multiple heat exchangers arranged in parallel or in series
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
    • F02B29/04—Cooling of air intake supply
    • F02B29/0406—Layout of the intake air cooling or coolant circuit
    • F02B29/0437—Liquid cooled heat exchangers
    • F02B29/0443—Layout of the coolant or refrigerant circuit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
    • F02M26/05—High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/14—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system
    • F02M26/15—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system in relation to engine exhaust purifying apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/23—Layout, e.g. schematics
    • F02M26/24—Layout, e.g. schematics with two or more coolers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/23—Layout, e.g. schematics
    • F02M26/27—Layout, e.g. schematics with air-cooled heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/23—Layout, e.g. schematics
    • F02M26/28—Layout, e.g. schematics with liquid-cooled heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/30—Tubes with restrictions, i.e. venturi or the like, e.g. for sucking air or measuring mass flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
    • F01N3/0335—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with exhaust silencers in a single housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

The present invention relates to an arrangement for cooling of recirculating exhaust gases of an inner combustion engine (2) in a vehicle (1). The arrangement comprises a first EGR cooler (14), a driving means (15, 31) adapted to driving air through the first EGR cooler (14) in order to cool the exhaust gases in a return line (11) which are subjected to a first step of cooling in the first EGR cooler (14), and at least one second EGR cooler (19, 20) in which the exhaust gases in the return line (11) are intended to undergo a second step of cooling. The arrangement comprises an air line (16) which extends at least from the first EGR cooler (14) to the exhaust pipe (4) at a location between the turbine (5) and the exhaust-treating component (18a, 18b), which air line (16) is adapted to leading warm air from the first EGR cooler (14) into the exhaust line (4) at said location.

Description

Device for the cooling internal combustion engines EGR gas
Technical field
The present invention relates to a kind of device of the EGR gas for cooling internal combustion engines, described internal-combustion engine comprises: the exhaust lay out that is suitable for from internal-combustion engine, waste gas being drawn, be arranged in turbine in exhaust lay out, be arranged in exhaust lay out and with respect to the appointment exhaust gas flow direction in exhaust lay out and be arranged in the waste gas treatment element of turbine downstream position and be suitable for the part waste gas of exhaust lay out is recycled to the return line of internal-combustion engine from the position of turbine upstream, this device comprises cooler for recycled exhaust gas and is suitable for driving air by the drive unit of cooler for recycled exhaust gas.
Background technique
Be known as the EGR(EGR) technology be the known approaches of a part of waste gas in the exhaust lay out of recirculation internal-combustion engine.Described EGR gas is guided through return line and is mixed with the air inlet for internal-combustion engine, and then mixed gas is directed into the cylinder of internal-combustion engine.Waste gas is joined to air and can make combustion temperature reduce, and lower combustion temperature especially makes the nitrogen oxide (NO in waste gas x) content reduce.This technology both can be used for Otto engine and also can be used for diesel engine.But the amount of the waste gas of IC engine supply depends on the pressure and temperature of waste gas.Supplying with large as far as possible exhausted air quantity just needs waste gas to carry out effective cooling before being drawn towards internal-combustion engine to internal-combustion engine.A kind of known practice be before EGR gas is drawn towards internal-combustion engine in one or more coolers for recycled exhaust gas cooling EGR gas.
At the run duration of the internal-combustion engine of for example diesel engine, waste gas will be in the temperature range of 150 ℃ to 600 ℃.The temperature of waste gas will change along with the load of internal-combustion engine.If the cooling system of internal-combustion engine is for cooling EGR gas, described cooling system will thereby can bear the high load peak value when internal-combustion engine bears high load.In heavy vehicle, the cooling system of internal-combustion engine is usually also for other cooling needs of vehicle, for example the hydraulic oil of cooling hydraulic retarder.Therefore, need to reduce the load of internal-combustion engine cooling system.
US2008/0256949 discloses a kind of device for EGR, thus, carries out the first step in the air cooling cooler for recycled exhaust gas in the engine cabin of EGR gas in being arranged in vehicle cooling.For this reason, the described cooler for recycled exhaust gas of the distinguished and admirable mistake of fan blow cool.It is cooling that after this EGR gas carries out second step by the freezing mixture in low-temperature cooling system.In this case, the air existed in engine cabin is cooling for making EGR gas stand the first step.Because EGR gas may be in very high temperature, the air in engine cabin can be heated to very high temperature at least partly.This very high air temperature can cause the neighbouring element in engine cabin to damage.
Exhaust lay out in vehicle generally includes one or more for carrying out the element of exhaust after-treatment before being released into surrounding atmosphere at waste gas.This element can be the catalyzer that is suitable for removing nitrogen oxide from waste gas.Yet, can reach in order to make them the optimum efficiency of removing nitrogen oxide NOx from waste gas, the catalyzer of most of kind need to be in a minimum temperature of accepting.For example, SCR(selective catalytic reduction) catalyzer needs the temperature of about 200 ℃.Another element for the diesel exhaust reprocessing is the particulate filter that is suitable for interception and gas of combustion soot dust granule.Described particulate filter similarly need to be in a minimum acceptable temperature so that it arrives gratifying effect.
In boosting internal combustion engine, waste gas is introduced into turbine.When waste gas releases energy in turbine, they are by the temperature of the pressure in reducing and reduction.Under the specific running state of internal-combustion engine, the temperature of the waste gas of turbine back may be very low so that catalyzer can not keep the best cleaning effect of minimum acceptable temperature and waste gas.
Summary of the invention
The objective of the invention is to propose the device of mentioning in a kind of foreword, it comprises the air-cooling type cooler for recycled exhaust gas, wherein because of the hot air that cooling EGR gas produces in the first cooler for recycled exhaust gas, can be used to improve the waste gas treatment of internal-combustion engine.
This purpose realizes by a kind of cooling device of EGR gas of the internal-combustion engine for vehicle, described internal-combustion engine comprises: the exhaust lay out that is suitable for from internal-combustion engine, waste gas being drawn, be arranged in turbine in exhaust lay out, be arranged in exhaust lay out and with respect to the appointment exhaust gas flow direction in exhaust lay out and be arranged in the waste gas treatment element of turbine downstream position and be suitable for the part waste gas of exhaust lay out is recycled to the return line of internal-combustion engine from the position of turbine upstream, this device also comprises: the first cooler for recycled exhaust gas; Be suitable for driving air to pass through the drive unit of the first cooler for recycled exhaust gas, with being intended in the first cooler for recycled exhaust gas in cooling return line, stand the cooling waste gas of the first step; With at least one the second cooler for recycled exhaust gas, in described at least one second cooler for recycled exhaust gas, it is cooling that waste gas in return line is intended to stand second step, it is characterized in that, this device comprises airline, its position at least extended between turbine and waste gas treatment element from the first cooler for recycled exhaust gas enters exhaust lay out, and this airline is suitable for entering exhaust lay out from the first cooler for recycled exhaust gas guiding hot air in described position.
Adopt this air-cooling type the first cooler for recycled exhaust gas, this device can realize that the first step of waste gas is cooling effectively.Waste gas, before being introduced into the second cooler for recycled exhaust gas, can be cooled to relatively low temperature here.For the load on the cooling system of cooling EGR gas in the second cooler for recycled exhaust gas thereby be significantly reduced.When the waste expansion in exhaust lay out passes through turbine, therefore waste gas have the temperature of reduction.Under specific running state, the temperature of the waste gas of turbine back may be down to and be made waste gas can not keep the level of the minimum acceptable temperature of waste gas treatment element.Yet the EGR gas of introducing return line will be positioned at a higher temperature, because they are from the exhaust lay out in the turbine upstream position.Air for cooling EGR gas can be heated to the temperature that approaches the EGR gas temperature.Adopt the first cooler for recycled exhaust gas of perfect size, air can be heated to the temperature higher than the temperature of the waste gas in the exhaust lay out in turbine downstream.The exhaust lay out that guides this hot air to enter the turbine downstream will heat up and provide the temperature of rising for the waste gas treatment element for waste gas provides.Most of waste gas treatment elements need minimum acceptable temperature in order to keep best waste gas treatment effect.The temperature that is the rising that obtains of waste gas treatment element by the present invention makes at most of internal combustion engine operation time durations waste gas treatment element can carry out best waste gas treatment.Guide hot air away from engine cabin and enter exhaust lay out such assurance is provided: the air in engine cabin will can not be heated to such level, and the temperature-sensing element (device) in engine cabin may cause the level of damaging.
According to one embodiment of present invention, drive unit is fan.Fan can be arranged in airline or the suitable position of close the first cooler for recycled exhaust gas.The size of fan will be confirmed as providing the expectation Air Flow through the first cooler for recycled exhaust gas, and the promotion air enters exhaust lay out.Replacedly, drive unit can be mounted in the jet pump device of close airline exit orifice in exhaust lay out.By such a jet pump device, when crossing the jet pump device, waste gas streams can produce negative pressure near in the airline of exhaust lay out.Therefore likely produce the Air Flow that enters exhaust lay out by the first cooler for recycled exhaust gas.
According to a preferred embodiment of the present invention, airline includes oral pore, and whereby, cooler for recycled exhaust gas is aspirated into air guide in the zone from its Air in ambient temperature.If the air that EGR gas is under ambient temperature is cooling, EGR gas can obtain extraordinary cooling.The inlet opening of airline can be positioned at the wheelhouse portions of vehicle.A relatively short airline can extend to the first cooler for recycled exhaust gas from wheelhouse portions here.Replacedly, the inlet opening of airline can be positioned at the front portion of vehicle.In the case, the inlet opening of airline need to be by coverings such as grids to stop particle and dust to be sucked in airline.The first cooler for recycled exhaust gas is advantageously located in the engine cabin of vehicle.During internal combustion engine operation, air by the temperature in raising, still can carry out the acceptable cooling of waste gas with respect to ambient air when waste gas has obviously high temperature than the air in engine cabin in the first cooler for recycled exhaust gas.In this case, airline only need to extend to the described position exhaust lay out from the first cooler for recycled exhaust gas.
According to one embodiment of present invention, described waste gas treatment element is catalyzer.Catalyzer needs relatively high temperature to bring into play their the best use of.During most of working time of internal-combustion engine, the waste gas in the exhaust lay out of catalyzer upstream increases hot air, can make catalyst temperature increase and have best nitrogen oxide to remove effect.Replacedly, the waste gas treatment element can be particulate filter.In diesel engine, soot dust granule is removed from waste gas by particulate filter.For the particle that makes to be intercepted in particulate filter is burnt, particulate filter need to be in a sufficiently high temperature.Increase hot air in the waste gas in the exhaust lay out of particulate filter upstream, can make the burning of the soot dust granule of intercepting strengthen.
According to another embodiment of the invention, EGR gas will be in the second cooler for recycled exhaust gas to carry out second step by the freezing mixture from internal-combustion engine cooling system cooling.The described cooling system of cooling internal combustion engines is the cooling system existed, its also can be effectively cooling for EGR gas.At normal operation period, the freezing mixture in internal-combustion engine cooling system will be in the temperature of 80-100 ℃.Therefore likely with the freezing mixture in internal-combustion engine cooling system, come cooling EGR gas to corresponding temperature.Experienced the first step due to EGR gas cooling in the first cooler for recycled exhaust gas, result in this case is that the load of internal-combustion engine cooling system is relatively appropriate.Because the primary purposes of this cooling system is cooling internal combustion engines, it should not be other cooling task and bears too large load, because this may cause damaging the cooling of combustion motor under these circumstances.
According to another preferred embodiment of the present invention, this device comprises the 3rd cooler for recycled exhaust gas, wherein EGR gas will realize that the 3rd step is cooling by freezing mixture, and described freezing mixture is compared the temperature in lower with the freezing mixture in internal-combustion engine cooling system at the run duration of internal-combustion engine.Because the freezing mixture in internal-combustion engine cooling system has the running temperature of 80-100 ℃, waste gas only can be cooled to the temperature that approaches coolant temperature in the second cooler for recycled exhaust gas.Usually the expectation cooled exhaust air is to lower temperature.For this reason, EGR gas can be in the 3rd cooler for recycled exhaust gas freezing mixture by low-temperature cooling system carry out coolingly, the freezing mixture in described low-temperature cooling system is compared in lower temperature with the freezing mixture in internal-combustion engine cooling system.Such low-temperature cooling system can comprise radiator element, and wherein the freezing mixture in cooling system comes cooling by the air under ambient temperature.Therefore freezing mixture in low-temperature cooling system can present the temperature that approaches ambient temperature.Before mixing with air at waste gas and being directed to internal-combustion engine, therefore waste gas can be cooled to relatively low temperature.Replacedly, waste gas can be cooling through the 3rd step in air-cooling type the 3rd cooler for recycled exhaust gas, and waste gas is advantageously undertaken cooling by the air under ambient temperature in this case.
The accompanying drawing explanation
With way of example, the preferred embodiments of the present invention are described below with reference to accompanying drawings, wherein:
Fig. 1 shows the device of the EGR gas for cooling diesel engine of first embodiment of the invention,
Fig. 2 shows the device of the EGR gas for cooling diesel engine of second embodiment of the invention, and
Fig. 3 more specifically shows the jet pump device in Fig. 2.
Embodiment
Fig. 1 shows the device for boosting internal combustion engine, and it is used for providing power to the vehicle 1 substantially illustrated.This diesel fuel for internal combustion engines machine 2 here is used as example.Diesel engine 2 can be used for providing power for heavy vehicle 1.Waste gas from the cylinder of diesel engine 2 is directed to exhaust lay out 4 by gas exhaust manifold 3.Diesel engine 2 has the turbine unit that comprises turbine 5 and compressor 6.Waste gas in exhaust lay out 4 will surpass atmospheric pressure and by initial guide to turbine 5.Therefore turbine 5 possesses driving power, and this driving power transfers to compressor 6 by link.Described compressor 6 utilizes this powered compressor to be inhaled into the air of inlet line 8 by air filter 7.Air in inlet line in coolant cools formula the first charger-air cooler 9 by initially cooling.Air is cooled by the freezing mixture from internal-combustion engine cooling system in the first charger-air cooler 9.Then the air of compression is cooled in coolant cools formula the second charger-air cooler 10.Air is cooled by the freezing mixture from low-temperature cooling system in the second charger-air cooler 10.
This device comprises return line 11, for the part waste gas of exhaust gas recirculation circuit 4 effectively.This return line 11 has from a position of turbine 5 upstreams to the expanded range of inlet line 8.Return line 11 comprises EGR valve 12, by means of this EGR valve 12, can turn-off the waste gas streams in return line 11.This EGR valve 12 also can be used for infinitely controlling and be directed to the exhausted air quantity of inlet line 8 from exhaust lay out 4 by return line 11.Control unit 13 is applicable to controlling EGR valve 12 according to the information of relevant diesel engine 2 current running statees.Return line 11 comprises and is applicable to making waste gas to stand the first cooling air-cooled cooler for recycled exhaust gas 14 of the first step.Fan 15 is for driving air to pass through described the first cooler for recycled exhaust gas 14.Fan 15 is applied to airline 16.Airline 16 has inlet opening 16a in the wheelhouse portions 17 of vehicle 1 and the exit orifice 16b in exhaust lay out 4, and exit orifice 16b is positioned at the downstream of turbine 5 and the upstream of baffler 18.Baffler 18 comprises the waste gas treatment element of catalyzer 18a and particulate filter 18b form, and catalyzer 18a is suitable for removing nitrogen oxide from waste gas, and particulate filter 18b is suitable for removing soot dust granule from EGR gas.After this waste gas in return line 11 be cooled in the second cooler for recycled exhaust gas 19 by the freezing mixture from internal-combustion engine cooling system.Described waste gas finally is cooled in the 3rd cooler for recycled exhaust gas 20 by the freezing mixture from low-temperature cooling system.
Internal-combustion engine 2 is cooled in a conventional manner by the cooling system that comprises circulating coolant.Freezing mixture in cooling system is recycled by coolant pump 21.The main flow of freezing mixture cycles through internal-combustion engine 2.At freezing mixture, after cooling internal combustion engines 2, freezing mixture is directed to the thermostat 23 in cooling system through circuit 22.When freezing mixture arrives normal running temperature, thermostat 23 is suitable for directing it to radiator 24 in order to be cooled.Radiator 24 is arranged on the front portion of vehicle 1.The sub-fraction of the freezing mixture in cooling system is still in not directed time internal-combustion engine 2, but is recycled by the circuit 25 that is divided into two parallel line 25a, 25b.Circuit 25a conduct coolant to the first charger-air cooler 9, wherein to make pressurized air stand the first step cooling for charger-air cooler 9.The first charger-air cooler 9 is taked the form of counter-flow heat exchanger.Therefore pressurized air and freezing mixture flow through the first charger-air cooler 9 with contrary direction.This makes the temperature that likely makes pressurized air be cooled to approaching the coolant inlet temperature in the first charger-air cooler 9.Circuit 25b conduct coolant to the second cooler for recycled exhaust gas 19, wherein it to make EGR gas stand the first step cooling.The second cooler for recycled exhaust gas 19 is taked the form of counter-flow heat exchanger.Therefore EGR gas and freezing mixture flow in the opposite direction through the second cooler for recycled exhaust gas 19.This obtains so that EGR gas is cooled to the temperature of the coolant inlet temperature that approaches the second cooler for recycled exhaust gas 19.The freezing mixture of cooling-air and the freezing mixture of cooled exhaust air combination again in circuit 25 in the second cooler for recycled exhaust gas 19 in the first charger-air cooler 9, this conduct coolant is back to circuit 22.The freezing mixture of heat is directed to radiator 24 by circuit 22.
Low-temperature cooling system comprises the radiator element 26 of radiator 24 front portions in the fringe region that is arranged on vehicle 1.Described fringe area is positioned at the anterior 1a of vehicle 1 in such cases.Radiation fan 27 is suitable for producing the flow of ambient air by radiator element 26 and radiator 24.Because radiator element 26 is positioned at the front portion of radiator 24, the freezing mixture in radiator element 26 is cooled by air at ambient temperature.Therefore freezing mixture in radiator element 26 can be cooled to the temperature that approaches ambient temperature.From the cold freezing mixture in radiator element 26, in low-temperature cooling system, by pump 29, in circuit 28, be recycled.Circuit 28 is divided into two parallel circuit 28a, 28b.Circuit 28a conduct coolant to the second charger-air cooler 10, wherein to make pressurized air stand second step cooling for charger-air cooler 10.The second charger-air cooler 10 is taked the form of counter-flow heat exchanger.This makes the temperature that likely makes pressurized air be cooled to approaching the coolant inlet temperature in the second charger-air cooler 10.Circuit 28b conduct coolant to the three coolers for recycled exhaust gas 20, wherein it to make EGR gas stand second step cooling.The 3rd cooler for recycled exhaust gas 20 is similarly taked the form of counter-flow heat exchanger.This obtains so that EGR gas is cooled to the temperature that approaches the coolant inlet temperature in the 3rd cooler for recycled exhaust gas 20.After freezing mixture is by the second charger-air cooler 10 and the 3rd cooler for recycled exhaust gas 20, circuit 28a, 28b combination again.Freezing mixture is directed to thereafter radiator element 26 to be cooled in circuit 28.
At diesel engine 2 run durations, the waste gas flowed out from diesel engine 2 enters exhaust lay out 4.During most of running statees of diesel engine 2, the unlatching that control unit 13 keeps EGR valve 12, a part of waste gas in exhaust lay out 4 is directed in return line 11 like this.Be introduced into waste gas in return line 11 usually by the temperature in 150 ℃ of-600 ℃ of scopes, this depends on the running state of diesel engine.It is cooling that EGR gas in return line 11 stands the first step in the first cooler for recycled exhaust gas 14, and this is by by fan 15, through inlet opening 16a, the air from wheelhouse portions 17 suction airline 16 completes cooling.Described inlet opening 16a has grid etc. to prevent that dust and particle are inhaled in airline 16.The air be drawn into airline 16 from wheelhouse portions will be substantially in ambient temperature.The fans drive air is through the first cooler for recycled exhaust gas 14.EGR gas can for example be cooled by air, and when EGR gas leaves the first cooler for recycled exhaust gas, they will be in the temperature of 150 ℃-200 ℃ like this.In the first cooler for recycled exhaust gas 14, the air of cooling EGR gas will stand corresponding intensification.Air can be heated to the temperature that approaches the temperature of EGR gas when being introduced into the first cooler for recycled exhaust gas 14 here.Described hot air is by being arranged in exhaust lay out 4 and the exit orifice 16b in the position of turbine 5 downstreams and baffler 18 upstreams is drawn from airline 16, and described baffler 18 comprises catalyzer 18a and particulate filter 18b.After waste gas has expanded in turbine 5, they will the temperature in a reduction under.The temperature of the waste gas in the exhaust lay out in turbine 5 downstreams therefore will be usually significantly lower than the temperature of hot air in airline 16.Introduce hot air in exhaust lay out 4 by the waste gas in thermal exhaust circuit 4, thus when waste gas arrives catalyzer 18a and particulate filter 18b by the temperature in rising.Increasing hot air therefore can make the running temperature of catalyzer 18a and particulate filter 18b raise.When running temperature is reduced to minimum acceptable temperature value, the ability of catalyzer 18a and particulate filter 18b processing waste gas can reduce.Therefore increase the running temperature that hot air to exhaust lay out 4 has raise in catalyzer 18a and filter 18b, make their running temperature can be frequently lower than minimum acceptable temperature value.
After EGR gas is cooled in the first cooler for recycled exhaust gas 14, they are directed to the second cooler for recycled exhaust gas 19, and wherein they are cooled by the freezing mixture from internal-combustion engine cooling system.Described freezing mixture here will be usually in the scope of 80 ℃-100 ℃.Therefore EGR gas can be cooled to the temperature of about 100 ℃-120 ℃ in the second cooler for recycled exhaust gas 19.EGR gas finally is directed to the 3rd cooler for recycled exhaust gas 20, and wherein they stand from the 3rd step of the freezing mixture of low-temperature cooling system cooling.Radiator element 26 in low-temperature cooling system is cooled by the air in ambient temperature, and described air is driven through radiator element 26 by radiation fan 27.Freezing mixture in low-temperature cooling system can be therefore in approaching the temperature of ambient temperature when it is introduced into the 3rd cooler for recycled exhaust gas 20.EGR gas therefore can be be cooled to the temperature that approaches ambient temperature before pressurized gas mixes in the 3rd cooler for recycled exhaust gas 20, described pressurized gas will be cooled in charger-air cooler 9,10 temperature accordingly effectively.The cooled mixed gas of waste gas and air is directed to diesel engine 2.Running state at diesel engine 2 in large load, it needs better cooling.Under this state, waste gas will be usually also in high-temperature.EGR gas is tentatively cooling by the first cooler for recycled exhaust gas 14, reduced substantially the temperature of waste gas before they are drawn towards the second cooler for recycled exhaust gas 19, in the second cooler for recycled exhaust gas 19, they realize that by the freezing mixture in internal-combustion engine cooling system second step is cooling.Adopt the first such cooler for recycled exhaust gas 14, the common cooling system of internal-combustion engine and the load on low-temperature cooling system can reduce significantly.The first cooler for recycled exhaust gas 14 is arranged on the internal-combustion engine 2 in vehicle 1 or on the chassis of engine cabin 30.The hot air produced when waste gas is cooled in the first cooler for recycled exhaust gas 14 is drawn from engine cabin 30 by airline 16 and exhaust lay out 4.Therefore this will not have the temperature in engine cabin 30 to become too high so that cause the risk that in engine cabin, temperature-sensing element (device) damages.
Fig. 2 shows the replaceability embodiment for the device of cooling EGR gas.In this case, jet pump device 31 is for aspirating air by airline 16 and the first cooler for recycled exhaust gas 14.In this kind of situation, air is inhaled into by the zone of the anterior 1a from vehicle 1.Airline 16 is included in the grid at 16a place, inlet opening etc. to stop dust and particle to be inhaled in airline 16.Air by the first cooler for recycled exhaust gas 14 and made EGR gas stand the first step cooling after, hot air is in the position of turbine 5 downstreams and baffler 18 upstreams is introduced into exhaust lay out 4.Fig. 3 shows jet pump 31 in greater detail and how to construct.Exhaust lay out 4 has constant substantially internal cross-sectional area A at the upstream and downstream of jet pump device 31 1.Jet pump device 31 comprises nozzle 31a, when nozzle 31a is limited to waste gas streams and crosses jet pump device 31 for the cross section reduced gradually of waste gas.Nozzle 31a has cross-sectional area A 2the waste gas outlet hole, A 2be less than significantly the exhaust lay out cross-sectional area A of jet pump device 31 upstreams 1.Airline 16 is connected to jet pump device 31 by exit orifice 16b, and exit orifice 16b is positioned at the radially outer position of exit orifice of nozzle 31a.This exit orifice causes the area of low pressure 31b of jet pump device 31.Jet pump device 31 comprises convergent part 31c at nozzle 31a downstream part, and this convergent part 31c has the cross-sectional area A reduced gradually on exhaust gas flow direction 3.Jet pump device 31 finally comprises disperses the 31d of section, and this is dispersed the 31d of section and have the cross-sectional area A increased gradually on exhaust gas flow direction 4.In the downstream of dispersing the 31d of section, exhaust lay out 4 recovers its initial internal cross-sectional area A 1.
When waste gas arrives jet pump 31, waste gas when they flow through nozzle 31a in exhaust lay out 4 obtains the speed increased, and therefore this nozzle limits a flow section with the cross-section area that successively decreases.When waste gas leaves nozzle 31a, therefore it will have the speed of increase.Low static pressure in low pressure area 31b be looped around nozzle 31a around.Described low static pressure causes air to be inhaled into low pressure area 31b from airline 16 by exit orifice 16b, the radially outward place of described exit orifice 16b in nozzle 31a.The air of inspiration low pressure area 31b is transferred into the converging portion 31c of jet pump device 31 by waste gas streams.In converging portion 31c, the speed of air increases.The speed increased in converging portion 31c has further strengthened jet pump device 31 by the ability of air inspiration exhaust lay out 4, and has therefore also strengthened by the ability of airline 16 and cooler for recycled exhaust gas 14 suction air.After this speed of waste gas and air reduce in the divergent section 31d of jet pump device 31.Thereafter the mixture of waste gas and hot air leaves jet pump device 31 and has cross-sectional area A 1exhaust lay out 4 in march to baffler 18.In this case, it is cooling that therefore EGR gas stands the first step in the first cooler for recycled exhaust gas 14, and this is undertaken cooling by the air the inlet opening 31a air amount circuit 16 in the anterior 1a of vehicle by jet pump device 31.That in this embodiment of other side, with Fig. 1, describes is consistent.
The present invention never is confined to embodiment described above, in the claim scope, can freely convert.

Claims (10)

1. the cooling device of the EGR gas of the internal-combustion engine for vehicle (1) (2), described internal-combustion engine comprises: be suitable for the exhaust lay out (4) of from internal-combustion engine (2), waste gas being drawn, be arranged in the turbine (5) in exhaust lay out (4), be arranged in exhaust lay out (4) and be positioned at the waste gas treatment element (18a of turbine (5) downstream position with respect to the appointment exhaust gas flow direction in exhaust lay out (4), 18b), and be suitable for the part waste gas in exhaust lay out (4) is recycled to from the position of turbine (5) upstream the return line (11) of internal-combustion engine (2), this device also comprises: the first cooler for recycled exhaust gas (14), be suitable for the drive unit (15,31) that drives air to pass through the first cooler for recycled exhaust gas (14), in cooling return line (11), to be intended in the first cooler for recycled exhaust gas (14) stand the cooling waste gas of the first step, with at least one the second cooler for recycled exhaust gas (19, 20), at described at least one second cooler for recycled exhaust gas (19, 20) in, it is cooling that waste gas in return line (11) is intended to stand second step, it is characterized in that, this device comprises airline (16), it at least extends at turbine (5) and waste gas treatment element (18a from the first cooler for recycled exhaust gas (14), position 18b) enters exhaust lay out (4), this airline (16) is suitable for from the first cooler for recycled exhaust gas (14) guiding hot air described at turbine (5) and waste gas treatment element (18a, position 18b) enters exhaust lay out (4), and the size of the first cooler for recycled exhaust gas (14) is made into and makes air be warming up to therein than the higher temperature of exhaust gas temperature in the exhaust lay out in turbine (5) downstream.
2. device according to claim 1, is characterized in that, drive unit is to be arranged in airline (16) or the fan (15) of close airline (16).
3. device according to claim 1, it is characterized in that, drive unit is jet pump device (31), and it is arranged in exhaust lay out (4) and the exit orifice (16b) of close airline (16) in described position between turbine (5) and waste gas treatment element (18a, 18b).
4. device according to claim 1, is characterized in that, described airline (16) includes oral pore (16a), and whereby, the zone from its Air in ambient temperature is by air intake and guide to the first cooler for recycled exhaust gas (14).
5. device according to claim 4, is characterized in that, airline inlet opening (16a) is positioned at the wheelhouse portions (17) of vehicle.
6. device according to claim 4, is characterized in that, airline inlet opening (16a) is positioned at the front portion (1a) of vehicle.
7. according to the described device of aforementioned any one claim, it is characterized in that, described waste gas treatment element is catalyzer (18a).
8. according to any one the described device in aforementioned claim 1-6, it is characterized in that, described waste gas treatment element is particulate filter (18b).
9. according to any one the described device in aforementioned claim 1-6, it is characterized in that, it is cooling that EGR gas is intended in the second cooler for recycled exhaust gas (19) to carry out second step by the freezing mixture from internal-combustion engine cooling system.
10. device according to claim 9, it is characterized in that, this device comprises the 3rd cooler for recycled exhaust gas (33,36), in the 3rd cooler for recycled exhaust gas, EGR gas is intended to realize that by freezing mixture the 3rd step is cooling, and described freezing mixture is compared the temperature in lower with the freezing mixture in internal-combustion engine cooling system at the normal operation period of internal-combustion engine.
CN201080010878.3A 2009-03-13 2010-03-01 Arrangement for cooling of recirculating exhaust gases of inner combustion engine Expired - Fee Related CN102341590B (en)

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